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No, tanin is the color that leaches out when you first put the driftwood in the tank. That is more likely the wood itself, soft because it has been in water for so long, or bio-film that has collected on the wood.

When I go fishing I just throw sharp rocks in the water and wait for the dead fish to float to the top... KingfisherEverything happens for a reason. Sometimes that reason is you are stupid and make bad decisions. I think my fish is adjusting well to the four gallon, He's laying on his side attempting to go to sleep on the bottom of the gravel.
Imitation is the sincerest form of flattery. Dear naps, sorry I hated you so much when I was a child... Love me

I have tons of manzanita in my tank and take it all out for a good scrubing about once every six months. I have low lighting and no plants so not much of an algae problem. don't think you will have a problem, but it would probably be best to clean them every now and then.